Multiple Choice
During which stage of mitosis do condensed chromosomes align at the cell’s equatorial plane (metaphase plate)?
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16. Cell Division
Mitosis
Multiple Choice
In mitosis, what is the primary role of spindle fibers (the mitotic spindle)?
A
They build the cell wall by depositing cellulose at the division plane during cytokinesis.
B
They form the nuclear envelope around each set of chromosomes at the start of mitosis.
C
They attach to chromosomes at kinetochores and move sister chromatids to opposite poles of the cell.
D
They replicate the cell’s DNA during S phase to ensure each daughter cell receives a complete genome.
Verified step by step guidance1
Understand that spindle fibers, also known as the mitotic spindle, are structures composed of microtubules that form during mitosis.
Recognize that the primary function of spindle fibers is related to chromosome movement and segregation during cell division.
Recall that spindle fibers attach to chromosomes at specialized protein structures called kinetochores, which are located at the centromere region of each chromosome.
Know that once attached, spindle fibers help align the chromosomes at the metaphase plate and then pull sister chromatids apart toward opposite poles of the cell during anaphase.
Conclude that the main role of spindle fibers is to ensure that each daughter cell receives an identical set of chromosomes by moving sister chromatids to opposite poles.
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